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Provides an interface for a series of objects. Q: How can it be realized? Answer: Provides abstract interfaces for multiple products杨天青的叔叔杨金山，是个有生理缺陷的染坊主，在折磨死两房太太后，为续香火，他又花大价钱买了个年轻漂亮的女人菊豆，对其百般虐待。年近四十而尚未娶亲的天青，对因叔叔每夜滥施淫威而痛苦哀叫的菊豆由怜生爱，两人私通，生得一子。金山喜出望外，以为己出，取名天白。但不久金山中风，半身不遂，菊豆与天青更加肆无忌惮，得知真相的金山想要报复，后却误坠染池丧命。按家族的规矩，天青要搬出染房，被迫分离的菊豆与天青只能暗地来往。Online and off-duty classes: The curriculum system is relatively mature and the products cover a wide range of age groups, which has shown the trend of online development.5. Not only that, you can also switch to the limit mode (also called adventure mode). The input method steps are the same. The code is/gamemode 2 and the onlooker mode is/gamemode 3.The observer pattern defines a one-to-many dependency, allowing multiple observer objects to listen to a topic object at the same time.